Actions

Multiattack .
The dragon can use its Frightful Presence.
It then makes three attacks: one with its bite and two with its claws.
Bite .
Melee Weapon Attack : +11 to hit, reach 10 ft., one target.
Hit : 17
(2d10 + 6) piercing damage plus 7
(2d6) poison damage.
Claw .
Melee Weapon Attack : +11 to hit, reach 5 ft., one target.
Hit : 13
(2d6 + 6) slashing damage.
Tail .
Melee Weapon Attack : +11 to hit, reach 15 ft., one target.
Hit : 15
(2d8 + 6) bludgeoning damage.
Frightful Presence .
Each creature of the dragon's choice that is within 120 feet of the dragon and aware of it must succeed on a DC 16 Wisdom saving throw or become frightened for 1 minute.
A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
If a creature's saving throw is successful or the effect ends for it, the creature is immune to the dragon's Frightful Presence for the next 24 hours.
Poison Breath
(Recharge 5-6) .
The dragon exhales poisonous gas in a 60-foot cone.
Each creature in that area must make a DC 18 Constitution saving throw, taking 56
(16d6) poison damage on a failed save, or half as much damage on a successful one.